Highest optical density = Diamond Lowest optical density = Air Optical density of a medium is directly related with the refractive index of that medium. A medium which has the highest refractive index will have the highest optical density and vice-versa. It can be observed from table 10.3 that diamoRead more
Highest optical density = Diamond
Lowest optical density = Air
Optical density of a medium is directly related with the refractive index of that medium. A medium which has the highest refractive index will have the highest optical density and vice-versa.
It can be observed from table 10.3 that diamond and air respectively have the highest and lowest refractive index. Therefore, diamond has the highest optical density and air has the lowest optical
density.
Refractive index of a medium, nm = Speed of light in vacuum/Speed of light in the medium Speed of light in vacuum, c = 3 × 108 ms-1 Refractive index of glass, ng = 1.50 Speed of light in the glass, v = Speed of light in vacuum/ Refractive index of glass = c/ng =3 × 108/1.50 = 2x 108 ms-1.
Refractive index of a medium, nm = Speed of light in vacuum/Speed of light in the medium
Speed of light in vacuum, c = 3 × 108 ms-1
Refractive index of glass, ng = 1.50
Speed of light in the glass, v = Speed of light in vacuum/ Refractive index of glass
= c/ng
=3 × 108/1.50 = 2x 108 ms-1.
The ray of light bends towards the normal.When a ray of light enters from an optically rarer medium (having low refractive index) to an optically denser medium (having high refractive index), its speed slows down and it bends towards the normal.Since water is optically denser than air, a ray of lighRead more
The ray of light bends towards the normal.When a ray of light enters from an optically rarer medium (having low refractive index) to an optically denser medium (having high refractive index), its speed slows down and it bends towards the normal.Since water is optically denser than air, a ray of light entering from air into water will bend towards the normal.
The small number of members in a population of tigers do not allow large number of variation to occur which are essential to survival of the species. A deadly disease or calamity may cause death of all the tigers. The small number of tiger also indicates that existing tiger variants are not well adoRead more
The small number of members in a population of tigers do not allow large number of variation to occur which are essential to survival of the species. A deadly disease or calamity may cause death of all the tigers. The small number of tiger also indicates that existing tiger variants are not well adopted to the existing environment and may extinct soon.
Traits acquired during a life-time cannot be inherited for successive generations as the changes do not reflect in the DNA of the germ cells. For instance, a football player cannot pass on his skills to his offspring as they are limited to non-reproductive cells only.
Traits acquired during a life-time cannot be inherited for successive generations as the changes do not reflect in the DNA of the germ cells. For instance, a football player cannot pass on his skills to his offspring as they are limited to non-reproductive cells only.
1. An individual trait may increase in a population in the following two ways:- The trait is beneficial to the population: if a trait is beneficial to a population, it will increase naturally. For example, green colour in beetles is favourable as it helps them in camouflage against the predators 2.BRead more
1. An individual trait may increase in a population in the following two ways:-
The trait is beneficial to the population: if a trait is beneficial to a population, it will increase naturally. For example, green colour in beetles is favourable as it helps them in camouflage against the predators
2.By accident: if a population faces an accident such that majority of its members get killed, the remaining members will pass on their traits to the subsequent generations. This will lead to an increase of the trait in the population.
3. By mutation
4. Natural Selection: if a trait is useful to the population, it will increase naturally.
After fertilization the lining of uterus thickens and is richly supplied with blood to nourish the growing embryo. The embryo gets nutrition from the mother’s blood with he help of a special tissue called placenta. It is embedded in the uterine wall. Placenta contains Villi on the embryo’s side of tRead more
After fertilization the lining of uterus thickens and is richly supplied with blood to nourish the growing embryo. The embryo gets nutrition from the mother’s blood with he help of a special tissue called placenta. It is embedded in the uterine wall. Placenta contains Villi on the embryo’s side of the tissue and blood spaces on mother’s side surrounding the villi. This provides a large surface from mother to the embryo and waste products from embryo to mother.
At the time of puberty, secondary sexual characters develop and sexual maturity takes place. This is manifested by many changes in both girls and boys. Some of the changes seen in girls at the time of puberty are as follows: a) Voice becomes thin b) Breasts enlarge c) Hips become rounded d) Hairs grRead more
At the time of puberty, secondary sexual characters develop and sexual maturity takes place. This is manifested by many changes in both girls and boys. Some of the changes seen in girls at the time of puberty are as follows:
a) Voice becomes thin
b) Breasts enlarge
c) Hips become rounded
d) Hairs grow under the armpit and in pubic area
The seminal vesicle and the prostate glands add their secretions so that the sperm are in a fluid which makes their transport easier and this fluid also provides nutrition.
The seminal vesicle and the prostate glands add their secretions so that the sperm are in a fluid which makes their transport easier and this fluid also provides nutrition.
Pollination is the process of transfer of pollens from anther to stigma. It occurs with the help of certain pollinators such as air, water, birds, or some insects. Fertilization, is the fusion of the male and female gametes. It occurs inside the ovule and leads to the formation of zygote.
Pollination is the process of transfer of pollens from anther to stigma. It occurs with the help of certain pollinators such as air, water, birds, or some insects.
Fertilization, is the fusion of the male and female gametes. It occurs inside the ovule and leads to the formation of zygote.
Find out, from Table 10.3, the medium having highest optical density. Also find the medium with lowest optical density.
Highest optical density = Diamond Lowest optical density = Air Optical density of a medium is directly related with the refractive index of that medium. A medium which has the highest refractive index will have the highest optical density and vice-versa. It can be observed from table 10.3 that diamoRead more
Highest optical density = Diamond
Lowest optical density = Air
Optical density of a medium is directly related with the refractive index of that medium. A medium which has the highest refractive index will have the highest optical density and vice-versa.
It can be observed from table 10.3 that diamond and air respectively have the highest and lowest refractive index. Therefore, diamond has the highest optical density and air has the lowest optical
See lessdensity.
Light enters from air to glass having refractive index 1.50. What is the speed of light in the glass? The speed of light in vacuum is 3 × 108 m s–1.
Refractive index of a medium, nm = Speed of light in vacuum/Speed of light in the medium Speed of light in vacuum, c = 3 × 108 ms-1 Refractive index of glass, ng = 1.50 Speed of light in the glass, v = Speed of light in vacuum/ Refractive index of glass = c/ng =3 × 108/1.50 = 2x 108 ms-1.
Refractive index of a medium, nm = Speed of light in vacuum/Speed of light in the medium
See lessSpeed of light in vacuum, c = 3 × 108 ms-1
Refractive index of glass, ng = 1.50
Speed of light in the glass, v = Speed of light in vacuum/ Refractive index of glass
= c/ng
=3 × 108/1.50 = 2x 108 ms-1.
A ray of light travelling in air enters obliquely into water. Does the light ray bend towards the normal or away from the normal? Why?
The ray of light bends towards the normal.When a ray of light enters from an optically rarer medium (having low refractive index) to an optically denser medium (having high refractive index), its speed slows down and it bends towards the normal.Since water is optically denser than air, a ray of lighRead more
The ray of light bends towards the normal.When a ray of light enters from an optically rarer medium (having low refractive index) to an optically denser medium (having high refractive index), its speed slows down and it bends towards the normal.Since water is optically denser than air, a ray of light entering from air into water will bend towards the normal.
See lessWhy are the small numbers of surviving tigers a cause of worry from the point of view of genetics?
The small number of members in a population of tigers do not allow large number of variation to occur which are essential to survival of the species. A deadly disease or calamity may cause death of all the tigers. The small number of tiger also indicates that existing tiger variants are not well adoRead more
The small number of members in a population of tigers do not allow large number of variation to occur which are essential to survival of the species. A deadly disease or calamity may cause death of all the tigers. The small number of tiger also indicates that existing tiger variants are not well adopted to the existing environment and may extinct soon.
See lessWhy are traits acquired during the life-time of an individual not inherited?
Traits acquired during a life-time cannot be inherited for successive generations as the changes do not reflect in the DNA of the germ cells. For instance, a football player cannot pass on his skills to his offspring as they are limited to non-reproductive cells only.
Traits acquired during a life-time cannot be inherited for successive generations as the changes do not reflect in the DNA of the germ cells. For instance, a football player cannot pass on his skills to his offspring as they are limited to non-reproductive cells only.
See lessWhat are the different ways in which individuals with a particular trait may increase in a population?
1. An individual trait may increase in a population in the following two ways:- The trait is beneficial to the population: if a trait is beneficial to a population, it will increase naturally. For example, green colour in beetles is favourable as it helps them in camouflage against the predators 2.BRead more
1. An individual trait may increase in a population in the following two ways:-
See lessThe trait is beneficial to the population: if a trait is beneficial to a population, it will increase naturally. For example, green colour in beetles is favourable as it helps them in camouflage against the predators
2.By accident: if a population faces an accident such that majority of its members get killed, the remaining members will pass on their traits to the subsequent generations. This will lead to an increase of the trait in the population.
3. By mutation
4. Natural Selection: if a trait is useful to the population, it will increase naturally.
How does the embryo get nourishment inside the mother’s body?
After fertilization the lining of uterus thickens and is richly supplied with blood to nourish the growing embryo. The embryo gets nutrition from the mother’s blood with he help of a special tissue called placenta. It is embedded in the uterine wall. Placenta contains Villi on the embryo’s side of tRead more
After fertilization the lining of uterus thickens and is richly supplied with blood to nourish the growing embryo. The embryo gets nutrition from the mother’s blood with he help of a special tissue called placenta. It is embedded in the uterine wall. Placenta contains Villi on the embryo’s side of the tissue and blood spaces on mother’s side surrounding the villi. This provides a large surface from mother to the embryo and waste products from embryo to mother.
See lessWhat are the changes seen in girls at the time of puberty?
At the time of puberty, secondary sexual characters develop and sexual maturity takes place. This is manifested by many changes in both girls and boys. Some of the changes seen in girls at the time of puberty are as follows: a) Voice becomes thin b) Breasts enlarge c) Hips become rounded d) Hairs grRead more
At the time of puberty, secondary sexual characters develop and sexual maturity takes place. This is manifested by many changes in both girls and boys. Some of the changes seen in girls at the time of puberty are as follows:
See lessa) Voice becomes thin
b) Breasts enlarge
c) Hips become rounded
d) Hairs grow under the armpit and in pubic area
What is the role of the seminal vesicles and the prostate gland?
The seminal vesicle and the prostate glands add their secretions so that the sperm are in a fluid which makes their transport easier and this fluid also provides nutrition.
The seminal vesicle and the prostate glands add their secretions so that the sperm are in a fluid which makes their transport easier and this fluid also provides nutrition.
See lessHow is the process of pollination different from fertilisation?
Pollination is the process of transfer of pollens from anther to stigma. It occurs with the help of certain pollinators such as air, water, birds, or some insects. Fertilization, is the fusion of the male and female gametes. It occurs inside the ovule and leads to the formation of zygote.
Pollination is the process of transfer of pollens from anther to stigma. It occurs with the help of certain pollinators such as air, water, birds, or some insects.
See lessFertilization, is the fusion of the male and female gametes. It occurs inside the ovule and leads to the formation of zygote.